Online particulate matter monitoring device and method based on single light source

A monitoring device and a technology for particulate matter, which are used in measurement devices, particle and sedimentation analysis, particle size analysis, etc., can solve the problems of increasing the probability of false triggering of particles, increasing the flying distance of particles, and reducing the efficiency of particle diameter measurement, so as to improve particle diameter measurement. Efficiency and ionization rate, reduce flight distance, and facilitate device debugging

Active Publication Date: 2016-10-12
FOCUSED PHOTONICS
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Problems solved by technology

Due to the use of two lasers, the placement distance between the two has certain restrictions (not too close)
In existing instruments, the distance between the two beams is generally more than a few centimeters, and the distance between the particles passing through the two laser beams is longer, which increases the flight distance of the particles, thereby reducing the efficiency of particle diameter measurement and increasing the probability of false triggering of particles
At the same time, the distance between the ionization point of the particle and the second caliper laser is generally more than ten centimeters, and the particle has traveled a long distance from passing through the first caliper laser to being ionized, resulting in a decrease in the ionization rate of the particle and affecting Aerosol Sampling System Focus Alignment Increased Requirements

Method used

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  • Online particulate matter monitoring device and method based on single light source
  • Online particulate matter monitoring device and method based on single light source

Examples

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Embodiment 1

[0040] figure 1 Schematically presents a simplified structural diagram of an on-line monitoring device for particulate matter based on a single light source in an embodiment of the present invention, as shown in figure 1 As shown, the particulate matter online monitoring device includes:

[0041] A single light source that emits circularly polarized light; the circularly polarized light is directly emitted by the single light source, or firstly emits linearly polarized light and then converts it into circularly polarized light;

[0042] a birefringent crystal, the circularly polarized light passes through the birefringent crystal, separates two beams of linearly polarized light whose polarization directions are perpendicular to each other, and passes through the detection area;

[0043] A detector, such as a photomultiplier tube, which is used to convert the scattered light signals of the particles through the two beams of linearly polarized light into electrical signals, and...

Embodiment 2

[0050] An application example of the online monitoring device and method according to Embodiment 1 of the present invention in atmospheric monitoring.

[0051] Such as figure 1 As shown, in this application example, the single light source includes: a laser 1 that emits linearly polarized light, a converging lens 2, and a mirror 3 for converting linearly polarized light into circularly polarized light Wave plate 4; converging lens 5, birefringent crystal 6, and the detector is a single photomultiplier tube; component analysis unit, comprising: an ionizing light source, such as an ultraviolet pulse laser, and the ionizing photoionization that the ionizing light source sends passes through the two beam lines Particles after polarized light; the mass analyzer is used to analyze the ionized particles, so as to know the composition of the particles.

[0052] On-line particle monitoring method based on single light source, such as figure 2 As shown, the particulate matter online...

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Abstract

The invention provides an online particulate matter monitoring device and method based on a single light source. The device comprises the single light source, a birefringent crystal, a detector and an analysis unit, wherein the single light source emits circular polarized light which penetrates through the birefringent crystal to generate two linearly polarized light beams with polarization directions perpendicular to each other, circular polarized light also penetrates through a detection area, the detector is used for converting particulate matter into electric signals through scattered light signals of the two linearly polarized light beams respectively and sending the electric signals into the analysis unit, and the analysis unit is used for obtaining the size of particulate matter in the detection area according to the received electric signals. The device has the advantages of being high in detection efficiency, low in cost and the like.

Description

technical field [0001] The invention relates to atmospheric monitoring, in particular to an on-line particle monitoring device and method based on a single light source. Background technique [0002] The online analysis method of atmospheric particulate matter based on mass spectrometry technology developed in recent years can not only realize the online analysis of the chemical composition of atmospheric particulate matter, but also detect the particle size of atmospheric particulate matter in real time. The basic implementation process is to measure the particle size by double-beam caliper method, and then ionize the particles by pulse laser, and the ionized ions are detected by mass analyzer. The double-beam caliper method used here is to measure the time for particles to pass through two fixed-space beams, and the particle size can be known from the calibration relationship between the measured time and the standard particle size. [0003] The existing double-beam calip...

Claims

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Application Information

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IPC IPC(8): G01N15/00G01N15/02
CPCG01N15/00G01N15/0205
Inventor 张汉君李园园华道柱黄伟叶华俊
Owner FOCUSED PHOTONICS
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